JPH07158502A - Combustion condition detecting device for internal combustion engine - Google Patents

Combustion condition detecting device for internal combustion engine

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Publication number
JPH07158502A
JPH07158502A JP30819893A JP30819893A JPH07158502A JP H07158502 A JPH07158502 A JP H07158502A JP 30819893 A JP30819893 A JP 30819893A JP 30819893 A JP30819893 A JP 30819893A JP H07158502 A JPH07158502 A JP H07158502A
Authority
JP
Japan
Prior art keywords
cylinder pressure
inter
integrated
integrated value
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP30819893A
Other languages
Japanese (ja)
Other versions
JP2917198B2 (en
Inventor
Satoru Watanabe
渡邊　　悟
Atsumi Hoshina
敦巳 保科
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Unisia Automotive Ltd
Original Assignee
Unisia Jecs Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Unisia Jecs Corp filed Critical Unisia Jecs Corp
Priority to JP30819893A priority Critical patent/JP2917198B2/en
Publication of JPH07158502A publication Critical patent/JPH07158502A/en
Application granted granted Critical
Publication of JP2917198B2 publication Critical patent/JP2917198B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To show a clearly different value of an inter-cylinder pressure integrated value so as to improve misfire detection accuracy even in a low rotational low load range by adding weight for every one of plural divided integrated term in the case of a combustion condition detected based on an integrated value of inter-cylinder pressure. CONSTITUTION:Ignition plugs are mounted while facing to combustion chambers of respective cylinders #1-#4, and inter-cylinder pressure sensors 10a-10d as inter-cylinder detection means are provided per each of cylinders #1-#2 as pairs with those ignition plugs. For the purpose of functions as an inter-cylinder pressure integration means, a weight adding means, an integrated value weight adding means, and a combustion condition detection means, control unit 12 is provided as software. Namely, a specified crank angle range is divided into a plural number of integrating sections, and the inter-cylinder pressure is integrated per each one of a plural number of integrating section. Weight is added to each of integrated sections in the case of finding an inter- cylinder pressure integrated value in the specified crank angle range, and then the integrated values are summed up. The sum value shows accurate variation of values depending upon the variation of the combustion condition.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は内燃機関の燃焼状態検出
装置に関し、詳しくは、筒内圧の積分値に基づいて燃焼
状態を検出する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion state detecting device for an internal combustion engine, and more particularly to a device for detecting a combustion state based on an integrated value of cylinder pressure.

【０００２】[0002]

【従来の技術】従来から、内燃機関の筒内圧を検出し、
該筒内圧の所定積分区間内における積分値に基づいて、
失火発生の有無を検出することが行なわれている（実開
昭６４−１５９３７号公報等参照）。上記のように筒内
圧の積分値を用いることで、筒内圧の瞬時値を用いて失
火発生を検出させる場合に比べ、圧力検出信号にノイズ
が重畳したときでも精度の良い失火検出が可能となる。2. Description of the Related Art Conventionally, a cylinder pressure of an internal combustion engine is detected,
Based on the integral value of the in-cylinder pressure within a predetermined integration interval,
The presence or absence of misfire has been detected (see Japanese Utility Model Laid-Open No. 64-15937, etc.). By using the integrated value of the in-cylinder pressure as described above, it is possible to perform accurate misfire detection even when noise is superimposed on the pressure detection signal, as compared with the case of detecting the occurrence of misfire by using the instantaneous value of the in-cylinder pressure. .

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、筒内圧
の積分値に基づいて燃焼状態を検出させる構成であって
も、燃焼による圧力発生の絶対値が小さい低回転低負荷
域では、失火時の積分値と正常燃焼時における積分値と
に大きな偏差が生じなくなるため、精度の良い失火検出
が困難であるという問題があった。However, even if the combustion state is detected based on the integral value of the in-cylinder pressure, in the low rotation and low load region where the absolute value of the pressure generated by the combustion is small, the integration at the time of misfire is caused. Since a large deviation does not occur between the value and the integrated value at the time of normal combustion, there is a problem that accurate misfire detection is difficult.

【０００４】本発明は上記問題点に鑑みなされたもので
あり、燃焼による発生圧力が小さい低回転低負荷域にお
いても、失火時と正常燃焼時とで筒内圧の積分値に明確
な偏差が生じるようにして、低回転低負荷域における失
火検出精度を向上させることを目的とする。The present invention has been made in view of the above problems. Even in a low rotation and low load region where the pressure generated by combustion is small, a clear deviation occurs in the integrated value of the in-cylinder pressure between misfire and normal combustion. Thus, it is an object to improve the accuracy of misfire detection in the low rotation and low load range.

【０００５】[0005]

【課題を解決するための手段】そのため本発明にかかる
内燃機関の燃焼状態検出装置は、図１に示すように構成
される。図１において、筒内圧検出手段は、内燃機関の
筒内圧を検出し、筒内圧積分手段は、所定のクランク角
範囲を区分してなる複数の積分区間毎に、前記筒内圧検
出手段で検出される筒内圧を積分する。Therefore, an internal combustion engine combustion state detecting apparatus according to the present invention is constructed as shown in FIG. In FIG. 1, the in-cylinder pressure detecting means detects the in-cylinder pressure of the internal combustion engine, and the in-cylinder pressure integrating means is detected by the in-cylinder pressure detecting means in each of a plurality of integration sections that divide a predetermined crank angle range. Integral the cylinder pressure.

【０００６】また、重み付け設定手段は、前記複数の積
分区間毎に筒内圧積分値の重み付けを設定する。そし
て、積分値重み付け手段は、前記筒内圧積分手段で前記
複数の積分区間毎に得られた筒内圧積分値を、前記重み
付け設定手段で設定された各積分区間毎の重み付けによ
ってそれぞれに重み付けを行なって合計し、前記所定の
クランク角範囲における筒内圧の積分値を求める。The weight setting means sets the weight of the in-cylinder pressure integrated value for each of the plurality of integration sections. Then, the integral value weighting means weights the in-cylinder pressure integral values obtained by the in-cylinder pressure integrating means for each of the plurality of integration intervals by weighting for each integration interval set by the weight setting means. Are summed up to obtain an integrated value of the in-cylinder pressure in the predetermined crank angle range.

【０００７】ここで、燃焼状態検出手段は、積分値重み
付け手段で得られた前記所定のクランク角範囲における
筒内圧の積分値に基づいて機関の燃焼状態を検出する。Here, the combustion state detecting means detects the combustion state of the engine on the basis of the integrated value of the in-cylinder pressure within the predetermined crank angle range obtained by the integral value weighting means.

【０００８】[0008]

【作用】かかる構成によると、所定のクランク角範囲が
複数の積分区間に区分され、該複数の積分区間毎に筒内
圧が積分される。そして、前記所定のクランク角範囲に
おける筒内圧積分値を求めるに当たって、各積分区間毎
に重み付けを行なって積分値を合計する。According to this structure, the predetermined crank angle range is divided into a plurality of integration sections, and the in-cylinder pressure is integrated for each of the plurality of integration sections. Then, in determining the in-cylinder pressure integrated value in the predetermined crank angle range, weighting is performed for each integration section and the integrated values are summed.

【０００９】即ち、燃焼状態の変化（失火の有無）が筒
内圧積分値の変化として大きく表れる積分区間における
積分結果が、最終的に合計したときの値に大きく影響す
るようにすることで、各積分区間における積分結果の合
計値が、燃焼状態の変化によって明確な値の変化を示す
ようにするものである。That is, by making the integration result in the integration section in which the change in the combustion state (presence or absence of misfire) largely appears as the change in the in-cylinder pressure integrated value has a great influence on the final summed value, The total value of the integration results in the integration section shows a clear change in the value due to the change in the combustion state.

【００１０】[0010]

【実施例】以下に本発明の実施例を説明する。一実施例
を示す図２において、内燃機関１には、エアクリーナ
２，スロットルチャンバ３，吸気マニホールド４を介し
て空気が吸入される。そして、機関１からの燃焼排気
は、排気マニホールド５，排気ダクト６，三元触媒７，
マフラー８を介して大気中に排出される。EXAMPLES Examples of the present invention will be described below. In FIG. 2 showing an embodiment, air is taken into the internal combustion engine 1 through an air cleaner 2, a throttle chamber 3 and an intake manifold 4. The combustion exhaust from the engine 1 is exhausted from the exhaust manifold 5, the exhaust duct 6, the three-way catalyst 7,
It is discharged into the atmosphere through the muffler 8.

【００１１】前記スロットルチャンバ３には、図示しな
いアクセルペダルに連動して開閉するスロットル弁９が
設けられており、このスロットル弁９によって機関１の
吸入空気量が調整されるようになっている。また、各気
筒（＃１〜＃４）の燃焼室に臨ませてそれぞれ点火栓
（図示省略）が装着されているが、かかる点火栓と対
に、それぞれの気筒毎に筒内圧検出手段としての筒内圧
センサ10ａ〜10ｄを設けてある。The throttle chamber 3 is provided with a throttle valve 9 which opens and closes in conjunction with an accelerator pedal (not shown), and the throttle valve 9 adjusts the intake air amount of the engine 1. Further, spark plugs (not shown) are mounted so as to face the combustion chambers of the cylinders (# 1 to # 4), respectively, and a pair of such spark plugs serves as in-cylinder pressure detection means for each cylinder. In-cylinder pressure sensors 10a-10d are provided.

【００１２】前記筒内圧センサ10ａ〜10ｄは、実開昭６
３−１７４３２号公報に開示されるような点火栓の座金
として装着されるタイプの他、特開平４−８１５５７号
公報に開示されるようなセンサ部を直接燃焼室内に臨ま
せて筒内圧を絶対圧として検出するタイプのものであっ
ても良い。また、機関１の図示しないカム軸には、カム
軸の回転を介してクランク角を検出するクランク角セン
サ11が設けられている。The in-cylinder pressure sensors 10a to 10d are actually opened 6
In addition to the type that is installed as a washer of a spark plug as disclosed in Japanese Patent Laid-Open No. 3-17432, a sensor unit as disclosed in Japanese Patent Laid-Open No. 4-81557 is directly exposed to the combustion chamber to absolutely measure the cylinder pressure. It may be a type of detecting as pressure. Further, a cam shaft (not shown) of the engine 1 is provided with a crank angle sensor 11 that detects a crank angle through rotation of the cam shaft.

【００１３】このクランク角センサ11は、本実施例の４
気筒機関１において、気筒間の行程位相差に相当するク
ランク角180 °毎の基準角度信号ＲＥＦと、単位クラン
ク角毎の単位角度信号ＰＯＳとをそれぞれ出力するセン
サである。尚、前記基準角度信号ＲＥＦは、気筒判別が
行なえるように、少なくとも特定１気筒に対応する検出
信号がそのパルス幅等によって他の検出信号と区別でき
るようになっている。This crank angle sensor 11 is the same as the crank angle sensor 11 of this embodiment.
In the cylinder engine 1, it is a sensor that outputs a reference angle signal REF for each crank angle of 180 ° corresponding to a stroke phase difference between cylinders, and a unit angle signal POS for each unit crank angle. In the reference angle signal REF, at least the detection signal corresponding to one specific cylinder can be distinguished from other detection signals by its pulse width or the like so that the cylinder can be discriminated.

【００１４】ここで、前記筒内圧センサ10ａ〜10ｄ及び
クランク角センサ11の出力は、機関制御用として設けら
れたコントロールユニット12に出力される。マイクロコ
ンピュータを内蔵したコントロールユニット12は、図示
しない燃料噴射弁による燃料噴射量や点火時期を制御す
る一方、図３のフローチャートに示すようにして前記筒
内圧センサ10ａ〜10ｄの出力に基づき各気筒別に燃焼状
態（失火状態）の検出を行なう。Here, the outputs of the in-cylinder pressure sensors 10a to 10d and the crank angle sensor 11 are output to a control unit 12 provided for engine control. The control unit 12 having a built-in microcomputer controls the fuel injection amount and the ignition timing by a fuel injection valve (not shown), and on the basis of the outputs of the in-cylinder pressure sensors 10a to 10d as shown in the flowchart of FIG. Detects the combustion state (misfire state).

【００１５】尚、本実施例において、筒内圧積分手段，
重み付け設定手段，積分値重み付け手段，燃焼状態検出
手段としての機能は、前記図３のフローチャートに示す
ように、コントロールユニット12がソフトウェア的に備
えている。図３のフローチャートは、所定のクランク角
範囲（例えばＡＴＤＣ10°〜ＢＴＤＣ70°或いは100
°）として設定された筒内圧積分区間の始期をトリガー
として割込み実行されるものである。In this embodiment, the cylinder pressure integrating means,
As shown in the flow chart of FIG. 3, the control unit 12 is provided with software functions as a weight setting means, an integral value weighting means, and a combustion state detecting means. The flowchart of FIG. 3 shows a predetermined crank angle range (for example, ATDC 10 ° to BTDC 70 ° or 100 ° C).
The start of the in-cylinder pressure integration section set as () is used as a trigger for interrupt execution.

【００１６】かかる図３のフローチャートにおいて、ま
ず、ステップ１（図中ではＳ１としてある。以下同様）
では、前記所定のクランク角範囲を複数に区分した分割
積分区間Ａ〜Ｅ（図４参照）をクランク角センサ11から
の検出信号に基づいて検出し、かかる分割積分区間Ａ〜
Ｅ毎に前記筒内圧センサ10ａ〜10ｄで検出される筒内圧
を積分し、各分割積分区間Ａ〜Ｅ毎の筒内圧積分値ＩＭ
ＥＰA 〜ＩＭＥＰE を得る。In the flow chart of FIG. 3, first, step 1 (denoted as S1 in the figure. The same applies hereinafter).
Then, the divided integral sections A to E (see FIG. 4) obtained by dividing the predetermined crank angle range into a plurality of sections are detected based on the detection signal from the crank angle sensor 11, and the divided integral sections A to E are detected.
The in-cylinder pressure detected by the in-cylinder pressure sensors 10a to 10d is integrated for each E, and the in-cylinder pressure integrated value IM for each divided integration section A to E is integrated.
Obtain EP A to IMEP E.

【００１７】本実施例では、前記所定のクランク角範囲
を等クランク角でＡ〜Ｅの５つに区分したが、クランク
角の設定範囲，分割数を限定するものでないことは明ら
かであり、また、各分割積分区間Ａ〜Ｅ毎に異なる角度
範囲としても良い。次のステップ２では、現在筒内圧の
積分を行なっているクランク角位置が、前記分割積分区
間Ａ〜Ｅのいずれに該当するかを判別し、予め各分割積
分区間Ａ〜Ｅ毎に設定されている重み付け定数ＫA 〜Ｋ
E の中から該当する重み付け定数を検索する。In the present embodiment, the predetermined crank angle range is divided into five equal crank angles A to E, but it is clear that the crank angle setting range and the number of divisions are not limited. The angular range may be different for each of the divided integration sections A to E. In the next step 2, it is determined which of the divided integration sections A to E the crank angle position at which the in-cylinder pressure is currently integrated corresponds to, and it is set in advance for each of the divided integration sections A to E. Weighting constant K A ~ K
Search E for the corresponding weighting constant.

【００１８】本実施例においては、重み付け定数ＫA 〜
ＫE をＫA ＝５％，ＫB ＝10％，Ｋ C ＝25％，ＫD ＝30
％，ＫE ＝30％として、分割積分区間Ａ〜Ｅの後半にな
るに従って重み付けを大きくしてある。これは、燃焼に
よる圧力発生の絶対値が小さくなる低回転低負荷域では
長期に渡って後燃えし、失火の有無による筒内圧の変化
が、最大燃焼圧を示すクランク角位置よりも後でより明
確になるためである。In this embodiment, the weighting constant KA~
KETo KA= 5%, KB= 10%, K C= 25%, KD= 30
%, KE= 30%, in the latter half of the divided integration section A to E
The weight is increased according to the above. This is for burning
In the low rotation and low load range where the absolute value of pressure generation due to
After burning for a long period of time, changes in cylinder pressure due to the presence or absence of misfire
However, it is clearer after the crank angle position that shows the maximum combustion pressure.
This is to make sure.

【００１９】従って、本実施例によると、重み付けを行
なわない場合に比べて、所定のクランク角範囲内におけ
る筒内圧積分値（ＩＭＥＰA 〜ＩＭＥＰE の合計）が失
火の有無によってより明確な差異を示すようになり、低
回転低負荷域においても高い精度で失火発生を検出させ
ることが可能となる。但し、前記重み付け定数は、失火
の有無が筒内圧積分値により明確に表れる区間に対して
より大きな重み付けがなされるようになっていれば良
く、必ずしも積分区間の後半ほど大きな重み付けがなさ
れる特性に限定されるものではない。また、各分割積分
区間Ａ〜Ｅ毎の重み付け定数ＫA 〜ＫE を機関運転条件
に応じて変化させるようにしても良い。Therefore, according to the present embodiment, the in-cylinder pressure integrated value (the total of IMEP A to IMEP E ) within a predetermined crank angle range has a clearer difference depending on the presence or absence of misfire, as compared with the case where no weighting is performed. As shown, it becomes possible to detect misfire occurrence with high accuracy even in a low rotation and low load range. However, the weighting constant may be such that a greater weight is given to a section in which presence or absence of misfire is clearly shown by the in-cylinder pressure integrated value. It is not limited. Further, the weighting constants K A to K E for each of the divided integration sections A to E may be changed according to the engine operating conditions.

【００２０】ステップ２で、当該分割積分区間における
重み付け定数Ｋx （ｘ＝Ａ〜Ｅ）を設定すると、次のス
テップ３では、当該分割積分区間における積分値ＩＭＥ
Ｐx（ｘ＝Ａ〜Ｅ）に前記重み付け定数Ｋx を乗算し
て、積分結果を更新設定する。ステップ４では、分割積
分区間Ａ〜Ｅの全てについて、筒内圧の積分と、該積分
結果の重み付け定数Ｋx （ｘ＝Ａ〜Ｅ）による更新設定
とが全て終了したか否かを判別し、分割積分区間Ｅにお
ける積分，重み付け処理が終了するまでは、ステップ１
〜３の処理を繰り返す。When the weighting constant K x (x = A to E) in the divided integration section is set in step 2, in the next step 3, the integrated value IME in the divided integration section is set.
P x (x = A to E) is multiplied by the weighting constant K x to update and set the integration result. In step 4, it is determined whether or not the integration of the in-cylinder pressure and the update setting by the weighting constant K x (x = A to E) of the integration result are all completed for all of the divided integration sections A to E, Until the integration and weighting processing in the divided integration section E is completed, step 1
Repeat the process of ~ 3.

【００２１】分割積分区間Ａ〜Ｅの全てで処理が終了す
ると、ステップ５へ進み、各分割積分区間Ａ〜Ｅ毎に積
分され、各分割積分区間Ａ〜Ｅ毎の重み付け定数ＫA 〜
ＫEで重み付けがなされた積分値ＩＭＥＰA 〜ＩＭＥＰ
E を合計することで、所定のクランク角範囲内における
筒内圧の積分値を求め、かかる合計値をＴＩＭＥＰにセ
ットする。When the processing is completed in all of the divided integration sections A to E, the process proceeds to step 5, where the integration is performed for each of the divided integration sections A to E, and the weighting constant K A to each of the divided integration sections A to E.
Integrated values IMEP A to IMEP weighted by K E
By summing E , an integrated value of the in-cylinder pressure within a predetermined crank angle range is obtained, and the total value is set in TIMEP.

【００２２】次のステップ６では、前記筒内圧積分値Ｔ
ＩＭＥＰと、基準値とを比較することで、失火発生の有
無を気筒別に検出する。前記基準値は、機関運転条件に
基づいて設定される値、或いは、前記筒内圧積分値ＴＩ
ＭＥＰの加重平均値に基づいて設定される値などを用い
ることができ、筒内圧積分値ＴＩＭＥＰを用いて行なわ
れる燃焼状態（失火状態）の検出を限定するものではな
い。In the next step 6, the in-cylinder pressure integrated value T
By comparing the IMEP with the reference value, the presence or absence of misfire occurrence is detected for each cylinder. The reference value is a value set based on engine operating conditions, or the in-cylinder pressure integrated value TI.
A value set based on the weighted average value of MEPs can be used, and detection of the combustion state (misfire state) performed using the in-cylinder pressure integrated value TIMEP is not limited.

【００２３】前記筒内圧積分値ＴＩＭＥＰは、分割され
た区間毎に重み付けを行なうことで、燃焼状態によって
明確な差が生じるように算出されるから、ステップ６に
おける失火診断では、たとえ低回転低負荷域であって
も、高精度な失火診断が可能である。The in-cylinder pressure integrated value TIMEP is calculated so that a clear difference occurs depending on the combustion state by weighting each divided section. Therefore, in the misfire diagnosis in step 6, even if the rotation speed is low, the load is low. Accurate misfire diagnosis is possible even in the region.

【００２４】[0024]

【発明の効果】以上説明したように本発明によると、筒
内圧の積分値に基づいて燃焼状態の検出を行なう装置に
おいて、分割した複数の積分区間毎に重み付けを行なう
ことによって、たとえ低回転低負荷域であっても筒内圧
積分値が燃焼状態に応じて明確に異なる値を示すように
でき、筒内圧積分値を用いた燃焼状態の検出精度を向上
させることができるという効果がある。As described above, according to the present invention, in the device for detecting the combustion state based on the integral value of the in-cylinder pressure, by weighting each of the plurality of divided integral sections, even if the low rotation speed is low. Even in the load range, the in-cylinder pressure integrated value can be made to show a value that clearly differs depending on the combustion state, and the combustion state detection accuracy using the in-cylinder pressure integrated value can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の基本構成を示すブロック図。FIG. 1 is a block diagram showing the basic configuration of the present invention.

【図２】本発明の一実施例を示すシステム概略図。FIG. 2 is a system schematic diagram showing an embodiment of the present invention.

【図３】実施例の失火検出の様子を示すフローチャー
ト。FIG. 3 is a flowchart showing how misfire detection is performed in the embodiment.

【図４】実施例における積分区間の分割の様子を示す線
図。FIG. 4 is a diagram showing how the integration interval is divided in the example.

【符号の説明】[Explanation of symbols]

１ 内燃機関 10ａ〜10ｄ 筒内圧センサ 11 クランク角センサ 12 コントロールユニット 1 Internal combustion engine 10a-10d Cylinder pressure sensor 11 Crank angle sensor 12 Control unit

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０１Ｍ 15/00 Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location G01M 15/00 Z

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】内燃機関の筒内圧を検出する筒内圧検出手
段と、 所定のクランク角範囲を区分してなる複数の積分区間毎
に、前記筒内圧検出手段で検出される筒内圧を積分する
筒内圧積分手段と、 前記複数の積分区間毎に筒内圧積分値の重み付けを設定
する重み付け設定手段と、 前記筒内圧積分手段で前記複数の積分区間毎に得られた
筒内圧積分値を、前記重み付け設定手段で設定された各
積分区間毎の重み付けによってそれぞれに重み付けを行
なって合計し、前記所定のクランク角範囲における筒内
圧の積分値を求める積分値重み付け手段と、 該積分値重み付け手段で得られた前記所定のクランク角
範囲における筒内圧の積分値に基づいて機関の燃焼状態
を検出する燃焼状態検出手段と、 を含んで構成されたことを特徴とする内燃機関の燃焼状
態検出装置。1. An in-cylinder pressure detecting means for detecting an in-cylinder pressure of an internal combustion engine, and an in-cylinder pressure detected by the in-cylinder pressure detecting means for each of a plurality of integration sections formed by dividing a predetermined crank angle range. In-cylinder pressure integrating means, weighting setting means for setting the weighting of the in-cylinder pressure integrated value for each of the plurality of integration sections, and the in-cylinder pressure integrated value obtained in each of the plurality of integration sections by the in-cylinder pressure integrating means, Integral value weighting means for obtaining the integrated value of the in-cylinder pressure in the predetermined crank angle range by performing weighting on each integral interval set by the weight setting means and summing them, and the integrated value weighting means A combustion state detecting means for detecting a combustion state of the engine based on an integrated value of the in-cylinder pressure in the predetermined crank angle range, and an internal combustion engine comprising: Baked state detecting device.
JP30819893A 1993-12-08 1993-12-08 Device for detecting combustion state of internal combustion engine Expired - Lifetime JP2917198B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30819893A JP2917198B2 (en) 1993-12-08 1993-12-08 Device for detecting combustion state of internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30819893A JP2917198B2 (en) 1993-12-08 1993-12-08 Device for detecting combustion state of internal combustion engine

Publications (2)

Publication Number Publication Date
JPH07158502A true JPH07158502A (en) 1995-06-20
JP2917198B2 JP2917198B2 (en) 1999-07-12

Family

ID=17978101

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30819893A Expired - Lifetime JP2917198B2 (en) 1993-12-08 1993-12-08 Device for detecting combustion state of internal combustion engine

Country Status (1)

Country Link
JP (1) JP2917198B2 (en)

Also Published As

Publication number Publication date
JP2917198B2 (en) 1999-07-12

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